US7450608B2 - Subscriber distribution network apparatus and subscriber line unit that facilitates connection to network switch - Google Patents

Subscriber distribution network apparatus and subscriber line unit that facilitates connection to network switch Download PDF

Info

Publication number
US7450608B2
US7450608B2 US10/794,308 US79430804A US7450608B2 US 7450608 B2 US7450608 B2 US 7450608B2 US 79430804 A US79430804 A US 79430804A US 7450608 B2 US7450608 B2 US 7450608B2
Authority
US
United States
Prior art keywords
signals
subscriber
signal
differential
network switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US10/794,308
Other versions
US20050078960A1 (en
Inventor
Jeong-Seok Choi
Do-Hun Cha
Yun-Je Oh
Jun-Ho Koh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHA, DO-HUN, CHOI, JEONG-SEOK, KOH, JUN-HO, OH, YUN-JE
Publication of US20050078960A1 publication Critical patent/US20050078960A1/en
Application granted granted Critical
Publication of US7450608B2 publication Critical patent/US7450608B2/en
Expired - Fee Related legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/2854—Wide area networks, e.g. public data networks
    • H04L12/2856—Access arrangements, e.g. Internet access
    • H04L12/2869—Operational details of access network equipments
    • H04L12/2878—Access multiplexer, e.g. DSLAM
    • H04L12/2879—Access multiplexer, e.g. DSLAM characterised by the network type on the uplink side, i.e. towards the service provider network
    • H04L12/2885—Arrangements interfacing with optical systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0071—Provisions for the electrical-optical layer interface

Definitions

  • the present invention relates to a convergence system of broadcasting and communication that provides subscribers by converging broadcasting and communication services through optical fiber transmission lines. More particularly, the present invention relates to a connection structure between a network switch (L 2 switch), such as a layer 2 for processing an IP over Ethernet that is a communication service, and a subscriber line unit (SLU) in a subscriber distribution network apparatus of a convergence system of broadcasting and communication.
  • L 2 switch network switch
  • SLU subscriber line unit
  • a communication network using the Ethernet protocol comprises a packet communication network that provides the foundation for most local area networks and Internet communication networks.
  • a 10 Base-T is commonly employed in most of the Ethernet communication networks utilized by subscribers, which is mainly used in local area networks, companies, and schools. Recent improvements in Ethernet technology has led to a metro Ethernet communication network providing subscriber homes with 100 Mbps Internet communication services of 100 Base-T by means of an unshielded twisted pair (hereinafter, referred to as an UTP) cable.
  • UTP unshielded twisted pair
  • a convergence system of broadcasting and communication that utilizes Ethernet communication networks, Ethernet equipment that multiplexes digital broadcasting streams and Ethernet data by a time division multiplexing (TDM), generates new types of digital streams, and distributes the generated digital streams to subscribers.
  • TDM time division multiplexing
  • FIG. 1 is a block diagram of a conventional convergence system of broadcasting and communication.
  • the conventional convergence system that provides broadcasting and communication services includes an optical line terminal (hereinafter, referred to as an OLT) 100 , an optical network unit (hereinafter, referred to as an ONU) 102 comprising a plurality of ONUs numbered from 1 to N, and optical cables that connect plurality of ONUs to the OLT 100 .
  • the OLT 100 receives broadcasting data from broadcasters to provide subscribers with broadcasting services by converting the data into an optical signal containing bundled components that correspond to the data, and then transmitting one tied optical signal.
  • the ONU 102 is a user-side apparatus that send information transmitted from the OLT 100 to subscribers. When broadcasting/communication data sent from broadcasters are subsequently transmitted to the ONU 102 via the OLT 100 , the ONU 102 receives the service requirements of subscribers from a set-top box 104 and then provides corresponding services.
  • ONU 102 functioning as an optical subscriber distribution network for the users via set-top boxes, which simultaneously provides broadcasting and communication in a convergence system of broadcasting and communication as described above
  • a commercial L 2 switch must be used as part of the network apparatus in order to process Ethernet-based packet data for communication services.
  • FIG. 2 shows a structure for connecting the commercial L 2 switch.
  • the switch outputs 100 Base-T signals in the ONU providing the convergence system of broadcasting and communication, to a plurality of subscriber line units (hereinafter, referred to as a SLU) for adding broadcasting signals, which are output from broadcasting signal receivers, to Ethernet signals outputted from the L 2 switch 110 (shown in FIG. 2 ).
  • SLU subscriber line units
  • FIG. 2 shows outside media attachment units (hereinafter, referred to as a MAU) 114 have UTP cable interfaces, as well as media converters (hereinafter, referred to as a MIC) 120 that are additionally provided in the ONU 102 .
  • the L 2 switch 110 is connected to SLUs 130 through the outside MAUs 114 having UTP cable interfaces and the M/Cs 120 .
  • the M/Cs 120 convert 100 Base-T signals into 100 Base-F signals in order to input the 100 Base-T signals outputted from the L 2 switch 110 to the SLUs 130 .
  • the L 2 switch 110 classifies the packets and controls paths of a commercial network switch outputting the 100 Base-T signals.
  • the L 2 switch 110 includes a PHY 112 (PHY is an abbreviation for physical chip), which is connected to a switch chipset 111 , and MAUs 113 .
  • PHY 112 PHY is an abbreviation for physical chip
  • MAUs 113 MAUs 113 .
  • Each of the MAUs 113 has a connector connection portion that connects each of the MAUs 113 to the PHY 112 through a connector.
  • each of the MAUs has a UTP cable connection portion to which a UTP cable is connected. Further, each of the MAUs 113 generates power for transmitting signals through the UTP cable.
  • FIG. 3 shows that each of the SLUs 130 includes a first PHY 131 , a time division multiplexing (hereinafter, referred to as a TDM) 132 , a plurality of transceiving modules 133 , a second PHY 134 provided between each of the transceiving modules 133 and the first PHY 131 , and a voltage signal conversion unit 135 .
  • the first PHY 131 converts parallel signals having a type of a media independent interface (hereinafter, referred to as a MII) into 100 Base-F signals, or which converts 100 Base-F signals into MII signals.
  • the TDM 132 multiplexes Ethernet signals having a MII type and broadcasting signals.
  • the voltage signal conversion unit 135 converts the multiplexed signal outputted from the TDM 132 into a differential positive emitter coupled logic (PECL) signal, which is a voltage signal having a predetermined level, and then the voltage signal conversion unit provides the PECL signal to the transceiving modules 133 .
  • the second PHY 134 converts the PECL signals provided from the transceiving modules 133 into MII signals and then provides the MII signals to the first PHY 131 .
  • the ONU 102 In designing the ONU 102 by means of the L 2 switch to process Ethernet-based packet data for communication services, the ONU 102 , which is an optical subscriber distribution network apparatus for simultaneously providing broadcasting and communication, must include a MAU 114 and a M/C 120 in order to connect the L 2 switch with the SLUs 130 .
  • the MAU 114 has an UTP cable connection portion and an RJ-45 connector connection portion, and the M/C 120 is used for converting 100 Base-T signals into 100 Base-F signals.
  • the commercial L 2 switch has an UTP cable interface. Therefore, when the commercial L 2 switch is used, it is necessary to provide separate apparatuses for the UTP cable interface between the commercial L 2 switch and the SLUs. Further, when one subscriber distribution network comprises a system for providing services to several hundred subscriber (400 ⁇ 500 subscribers), a plurality of UTP cables are used for connecting the L 2 switch to the plurality of SLUs. Therefore, the structure of the system becomes more complicated and the volume of the system increases, thereby having difficulties in providing an efficient subscriber distribution network.
  • the present invention has been made to solve the above-mentioned problems.
  • the present invention provides a subscriber distribution network apparatus that can in simple fashion connect subscriber line units (SLUs) to a network switch.
  • SLUs subscriber line units
  • a subscriber distribution network apparatus having a backplane board, which includes a network switch and a plurality of subscriber line units, the network switch switching Ethernet data and broadcasting data, the plurality of subscriber line units being provided between the network switch and subscriber set-tops, providing data from the network switch to a corresponding subscriber set-top box, and providing data transmitted from the subscriber set-tops to the network switch, wherein, the network switch includes a switch chipset and a first differential driver that converts serial signals of Ethernet data and broadcasting data outputted from the switch chipset into differential signals.
  • each of the subscriber line units includes a second differential driver, a signal converter, a time division multiplexing processing unit, and an optical transceiving module.
  • the second differential driver is connected to the first differential driver through a connector and restores the differential signals into serial signals.
  • the signal converter converts the serial signals output from the second differential driver into parallel signals.
  • the time division multiplexing processing unit multiplexes the Ethernet signal and broadcast signal output in parallel to each other from the signal converter, and converts the multiplexed signal into a voltage signal having a predetermined level.
  • the optical transceiving module converts the voltage signal into an optical signal, outputs the optical signal to the subscriber set-tops, and provides the second differential driver with signals transmitted from the subscriber set-tops.
  • FIG. 1 is a block diagram of a conventional convergence system of broadcasting and communication
  • FIG. 2 is a block diagram showing a structure for connecting a L 2 switch to subscriber line units (SLUs) in a subscriber distribution network apparatus of a conventional convergence system of broadcasting and communication;
  • SLUs subscriber line units
  • FIG. 3 is a block diagram of each of the SLUs in FIG. 2 ;
  • FIG. 4 is a block diagram showing a structure for connecting a L 2 switch to subscriber line units (SLUs) in a subscriber distribution network apparatus according to the present invention.
  • FIG. 5 is a block diagram of each of the SLUs in FIG. 4 .
  • FIG. 4 is a block diagram of a subscriber distribution network apparatus according to the present invention. As shown in FIG. 4 , a network switch 20 is connected to SLUs 30 through connectors and provided in the same backplane board 10 .
  • the network switch 20 is newly constituted, and includes a switch chipset 21 and a differential driver 22 .
  • the differential driver 22 is connected to the SLUs 30 through connectors.
  • the switch chipset 21 in the network switch 20 switches Ethernet signals transmitted from an OLT and provides the switched signals to corresponding SLUs.
  • the switch chipset 21 outputs signals that have a type of a serial media independent interface (hereinafter, referred to as a SMII) or a source synchronous SMII (hereinafter, referred to as a SSSMII), to the differential driver 22 .
  • the differential driver 22 converts the SMII signals or SSSMII signals into differential SMII signals or differential SSSMII signals and then outputs the converted signals to the SLUs 30 .
  • FIG. 5 is a block diagram of each of the SLUs shown in FIG. 4 .
  • each of the SLUs 30 includes a differential driver 31 , a signal converter 32 , a time division multiplexor (hereinafter, referred to as a TDM) 33 , a voltage signal conversion unit 36 , a plurality of optical transceiving modules 34 , and a PHY 35 .
  • the differential driver 31 is connected to the network switch 20 through a connector.
  • the signal converter 32 is connected to one side of the differential driver 31 .
  • the TDM 33 is connected to an output side of the signal converter 32 .
  • the voltage signal conversion unit 36 is connected to an output side of the TDM 33 .
  • the plurality of optical transceiving modules 34 are connected to an output side of the voltage signal conversion unit 36 .
  • the PHY 35 is provided between the differential driver 31 and the optical transceiving modules 34 and converts optical signals output from the optical transceiving modules 34 into SMII signals.
  • the differential driver 31 converts differential SMII signals or SSSMII signals provided from the network switch 20 into SMII signals and then provides the SMII signals to the signal converter 32 .
  • the signal converter 32 converts the SMII signals into MII signals and then provides the MII signals to the TDM 33 .
  • the TDM 33 multiplexes Ethernet signals having a MII type and broadcasting signals and then provides the multiplexed signal to the voltage signal conversion unit 36 .
  • the voltage signal conversion unit 36 converts the multiplexed signal into a differential positive emitter coupled logic (hereinafter, referred to as a PECL) signal and then provides the differential PECL signal to the optical transceiving modules 34 .
  • the optical transceiving modules 34 generate optical signals according to the differential PECL signal and then transmit the optical signals to the subscriber set-top boxes (not shown).
  • the optical transceiving modules 34 convert optical signals transmitted from the subscriber set-top boxes into differential PECL signals and then outputs the differential PECL signals to the PHY 35 .
  • the PHY 35 converts the received differential PECL signals into SMII signals and then outputs the SMII signals to the differential driver 31 .
  • the differential driver 31 subsequently converts the SMII signals into differential SMII signals and then provides the differential SMII signals to the network switch 20 .
  • each of the SLUs 30 receives the differential SMII signals, which are outputted from the network switch 20 , through the differential driver 31 and the signal converter 32 . Further, each of the SLUs 30 multiplexes the MII signals outputted from the signal converter 32 by the TDM 33 , converts the multiplexed signal into a voltage signal by the PHY 35 , converts the voltage signal into an optical signal by each of the optical transceiving modules 34 , and then outputs the optical signal.
  • the network switch has a differential driver employing a connector as an interface, and the SLUs connected to the network switch are constructed to process the signals of the differential driver, so that the network switch can be connected to the SLUs by the connectors. Therefore, the data can be transmitted through the connectors between the SLUs and the network switch differently from the commercial L 2 switch, which requires UTP cables for connection with the SLUs. That is, the switch chipset 21 of the network switch can be directly connected to the SLUs 30 connected to the network switch. As a result, the network switch and the SLUs 30 can be mounted in the same backplane board, and 10/100 M Ethernet data having a SMII type of the network switch can be transmitted to the SLUs 30 through the connectors instead of UTP cables.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Optical Communication System (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

A subscriber distribution network includes a backplane board that has a network switch and a plurality of subscriber line units, the network data, the plurality of subscriber line units being provided between the network switch and subscriber set-tops, providing data from the network switch to a corresponding subscriber set-top, and providing data transmitted from the subscriber set-tops to the network switch. In the subscriber distribution network apparatus, the network switch can be connected in simple fashion to the subscriber line units by connectors.

Description

CLAIM OF PRIORITY
This application claims priority to an application entitled “Subscriber distribution network apparatus and subscriber line unit which can in simple fashion connect with network switch,” filed in the Korean Intellectual Property Office on Sep. 16, 2003 and assigned Ser. No. 2003-64071, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a convergence system of broadcasting and communication that provides subscribers by converging broadcasting and communication services through optical fiber transmission lines. More particularly, the present invention relates to a connection structure between a network switch (L2 switch), such as a layer 2 for processing an IP over Ethernet that is a communication service, and a subscriber line unit (SLU) in a subscriber distribution network apparatus of a convergence system of broadcasting and communication.
2. Description of the Related Art
In general, a communication network using the Ethernet protocol comprises a packet communication network that provides the foundation for most local area networks and Internet communication networks.
A 10 Base-T is commonly employed in most of the Ethernet communication networks utilized by subscribers, which is mainly used in local area networks, companies, and schools. Recent improvements in Ethernet technology has led to a metro Ethernet communication network providing subscriber homes with 100 Mbps Internet communication services of 100 Base-T by means of an unshielded twisted pair (hereinafter, referred to as an UTP) cable.
A convergence system of broadcasting and communication that utilizes Ethernet communication networks, Ethernet equipment that multiplexes digital broadcasting streams and Ethernet data by a time division multiplexing (TDM), generates new types of digital streams, and distributes the generated digital streams to subscribers.
FIG. 1 is a block diagram of a conventional convergence system of broadcasting and communication. As shown in FIG. 1, the conventional convergence system that provides broadcasting and communication services includes an optical line terminal (hereinafter, referred to as an OLT) 100, an optical network unit (hereinafter, referred to as an ONU) 102 comprising a plurality of ONUs numbered from 1 to N, and optical cables that connect plurality of ONUs to the OLT 100. The OLT 100 receives broadcasting data from broadcasters to provide subscribers with broadcasting services by converting the data into an optical signal containing bundled components that correspond to the data, and then transmitting one tied optical signal. The ONU 102 is a user-side apparatus that send information transmitted from the OLT 100 to subscribers. When broadcasting/communication data sent from broadcasters are subsequently transmitted to the ONU 102 via the OLT 100, the ONU 102 receives the service requirements of subscribers from a set-top box 104 and then provides corresponding services.
In designing the ONU 102 functioning as an optical subscriber distribution network for the users via set-top boxes, which simultaneously provides broadcasting and communication in a convergence system of broadcasting and communication as described above, a commercial L2 switch must be used as part of the network apparatus in order to process Ethernet-based packet data for communication services.
FIG. 2 shows a structure for connecting the commercial L2 switch. The switch outputs 100 Base-T signals in the ONU providing the convergence system of broadcasting and communication, to a plurality of subscriber line units (hereinafter, referred to as a SLU) for adding broadcasting signals, which are output from broadcasting signal receivers, to Ethernet signals outputted from the L2 switch 110 (shown in FIG. 2 ).
FIG. 2 shows outside media attachment units (hereinafter, referred to as a MAU) 114 have UTP cable interfaces, as well as media converters (hereinafter, referred to as a MIC) 120 that are additionally provided in the ONU 102. Further, the L2 switch 110 is connected to SLUs 130 through the outside MAUs 114 having UTP cable interfaces and the M/Cs 120. Herein, the M/Cs 120 convert 100 Base-T signals into 100 Base-F signals in order to input the 100 Base-T signals outputted from the L2 switch 110 to the SLUs 130.
The L2 switch 110 classifies the packets and controls paths of a commercial network switch outputting the 100 Base-T signals. In general, the L2 switch 110 includes a PHY 112 (PHY is an abbreviation for physical chip), which is connected to a switch chipset 111, and MAUs 113. Each of the MAUs 113 has a connector connection portion that connects each of the MAUs 113 to the PHY 112 through a connector. In addition, each of the MAUs has a UTP cable connection portion to which a UTP cable is connected. Further, each of the MAUs 113 generates power for transmitting signals through the UTP cable.
FIG. 3 shows that each of the SLUs 130 includes a first PHY 131, a time division multiplexing (hereinafter, referred to as a TDM) 132, a plurality of transceiving modules 133, a second PHY 134 provided between each of the transceiving modules 133 and the first PHY 131, and a voltage signal conversion unit 135. The first PHY 131 converts parallel signals having a type of a media independent interface (hereinafter, referred to as a MII) into 100 Base-F signals, or which converts 100 Base-F signals into MII signals. The TDM 132 multiplexes Ethernet signals having a MII type and broadcasting signals. The voltage signal conversion unit 135 converts the multiplexed signal outputted from the TDM 132 into a differential positive emitter coupled logic (PECL) signal, which is a voltage signal having a predetermined level, and then the voltage signal conversion unit provides the PECL signal to the transceiving modules 133. The second PHY 134 converts the PECL signals provided from the transceiving modules 133 into MII signals and then provides the MII signals to the first PHY 131.
In designing the ONU 102 by means of the L2 switch to process Ethernet-based packet data for communication services, the ONU 102, which is an optical subscriber distribution network apparatus for simultaneously providing broadcasting and communication, must include a MAU 114 and a M/C 120 in order to connect the L2 switch with the SLUs 130. The MAU 114 has an UTP cable connection portion and an RJ-45 connector connection portion, and the M/C 120 is used for converting 100 Base-T signals into 100 Base-F signals.
As described above, the commercial L2 switch has an UTP cable interface. Therefore, when the commercial L2 switch is used, it is necessary to provide separate apparatuses for the UTP cable interface between the commercial L2 switch and the SLUs. Further, when one subscriber distribution network comprises a system for providing services to several hundred subscriber (400˜500 subscribers), a plurality of UTP cables are used for connecting the L2 switch to the plurality of SLUs. Therefore, the structure of the system becomes more complicated and the volume of the system increases, thereby having difficulties in providing an efficient subscriber distribution network.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made to solve the above-mentioned problems. The present invention provides a subscriber distribution network apparatus that can in simple fashion connect subscriber line units (SLUs) to a network switch.
In order to accomplish the aforementioned objects, according to an aspect of the present invention, there is provided a subscriber distribution network apparatus having a backplane board, which includes a network switch and a plurality of subscriber line units, the network switch switching Ethernet data and broadcasting data, the plurality of subscriber line units being provided between the network switch and subscriber set-tops, providing data from the network switch to a corresponding subscriber set-top box, and providing data transmitted from the subscriber set-tops to the network switch, wherein, the network switch includes a switch chipset and a first differential driver that converts serial signals of Ethernet data and broadcasting data outputted from the switch chipset into differential signals. According to the present invention, each of the subscriber line units includes a second differential driver, a signal converter, a time division multiplexing processing unit, and an optical transceiving module. The second differential driver is connected to the first differential driver through a connector and restores the differential signals into serial signals. The signal converter converts the serial signals output from the second differential driver into parallel signals. The time division multiplexing processing unit multiplexes the Ethernet signal and broadcast signal output in parallel to each other from the signal converter, and converts the multiplexed signal into a voltage signal having a predetermined level. Finally, the optical transceiving module converts the voltage signal into an optical signal, outputs the optical signal to the subscriber set-tops, and provides the second differential driver with signals transmitted from the subscriber set-tops.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a block diagram of a conventional convergence system of broadcasting and communication;
FIG. 2 is a block diagram showing a structure for connecting a L2 switch to subscriber line units (SLUs) in a subscriber distribution network apparatus of a conventional convergence system of broadcasting and communication;
FIG. 3 is a block diagram of each of the SLUs in FIG. 2;
FIG. 4 is a block diagram showing a structure for connecting a L2 switch to subscriber line units (SLUs) in a subscriber distribution network apparatus according to the present invention; and
FIG. 5 is a block diagram of each of the SLUs in FIG. 4.
 DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, one or more preferred aspects of the present invention will be described with reference to the accompanying drawings. The same reference numerals are used to designate the same elements as those shown in other drawings. In the description below, there are many particular items, such as detailed elements of circuit, are shown, but these are provided for helping the general understanding of the present invention. It is to be understood by those skilled in the art that the present invention can be embodied without such particular items. In the following description of the present invention, there are instances when a detailed description of known functions and configuration incorporated herein will be omitted when it may possible obscure the subject matter of the present invention FIG. 4 is a block diagram of a subscriber distribution network apparatus according to the present invention. As shown in FIG. 4, a network switch 20 is connected to SLUs 30 through connectors and provided in the same backplane board 10.
According to the present invention, the network switch 20, is newly constituted, and includes a switch chipset 21 and a differential driver 22. The differential driver 22 is connected to the SLUs 30 through connectors. The switch chipset 21 in the network switch 20 switches Ethernet signals transmitted from an OLT and provides the switched signals to corresponding SLUs.
Further, the switch chipset 21 outputs signals that have a type of a serial media independent interface (hereinafter, referred to as a SMII) or a source synchronous SMII (hereinafter, referred to as a SSSMII), to the differential driver 22. Further, the differential driver 22 converts the SMII signals or SSSMII signals into differential SMII signals or differential SSSMII signals and then outputs the converted signals to the SLUs 30.
FIG. 5 is a block diagram of each of the SLUs shown in FIG. 4. As shown in FIG. 5, each of the SLUs 30 includes a differential driver 31, a signal converter 32, a time division multiplexor (hereinafter, referred to as a TDM) 33, a voltage signal conversion unit 36, a plurality of optical transceiving modules 34, and a PHY 35. The differential driver 31 is connected to the network switch 20 through a connector. The signal converter 32 is connected to one side of the differential driver 31. The TDM 33 is connected to an output side of the signal converter 32. The voltage signal conversion unit 36 is connected to an output side of the TDM 33. The plurality of optical transceiving modules 34 are connected to an output side of the voltage signal conversion unit 36. The PHY 35 is provided between the differential driver 31 and the optical transceiving modules 34 and converts optical signals output from the optical transceiving modules 34 into SMII signals.
The differential driver 31 converts differential SMII signals or SSSMII signals provided from the network switch 20 into SMII signals and then provides the SMII signals to the signal converter 32. The signal converter 32 converts the SMII signals into MII signals and then provides the MII signals to the TDM 33. The TDM 33 multiplexes Ethernet signals having a MII type and broadcasting signals and then provides the multiplexed signal to the voltage signal conversion unit 36. The voltage signal conversion unit 36 converts the multiplexed signal into a differential positive emitter coupled logic (hereinafter, referred to as a PECL) signal and then provides the differential PECL signal to the optical transceiving modules 34. The optical transceiving modules 34 generate optical signals according to the differential PECL signal and then transmit the optical signals to the subscriber set-top boxes (not shown).
Further, the optical transceiving modules 34 convert optical signals transmitted from the subscriber set-top boxes into differential PECL signals and then outputs the differential PECL signals to the PHY 35. The PHY 35 converts the received differential PECL signals into SMII signals and then outputs the SMII signals to the differential driver 31. The differential driver 31 subsequently converts the SMII signals into differential SMII signals and then provides the differential SMII signals to the network switch 20.
According to the present invention, each of the SLUs 30 receives the differential SMII signals, which are outputted from the network switch 20, through the differential driver 31 and the signal converter 32. Further, each of the SLUs 30 multiplexes the MII signals outputted from the signal converter 32 by the TDM 33, converts the multiplexed signal into a voltage signal by the PHY 35, converts the voltage signal into an optical signal by each of the optical transceiving modules 34, and then outputs the optical signal.
As described above, the network switch has a differential driver employing a connector as an interface, and the SLUs connected to the network switch are constructed to process the signals of the differential driver, so that the network switch can be connected to the SLUs by the connectors. Therefore, the data can be transmitted through the connectors between the SLUs and the network switch differently from the commercial L2 switch, which requires UTP cables for connection with the SLUs. That is, the switch chipset 21 of the network switch can be directly connected to the SLUs 30 connected to the network switch. As a result, the network switch and the SLUs 30 can be mounted in the same backplane board, and 10/100 M Ethernet data having a SMII type of the network switch can be transmitted to the SLUs 30 through the connectors instead of UTP cables.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (15)

1. A subscriber distribution network apparatus having a backplane board which includes a network switch and a plurality of subscriber line units (SLUs), the network switch switching both Ethernet data and broadcasting data, and the plurality of subscriber line units being provided between the network switch and subscriber set-tops so as to provide data from the network switch to a corresponding subscriber set-top, and to provide data transmitted from the subscriber set-tops back to the network switch,
wherein the network switch comprises a switch chipset and a first differential driver which converts serial signals of Ethernet data and broadcasting data outputted from the switch chipset into differential signals, and
wherein each SLU includes a second differential driver, a signal converter, a time division multiplexing processing unit, and an optical transceiving module, the second differential driver being connected to the first differential driver through a connector and restoring the differential signals into serial signals, the signal converter converting the serial signals outputted from the second differential driver into parallel signals, the time division multiplexing processing unit multiplexing Ethernet signal and broadcasting signal outputted in parallel to each other from the signal converter and converting the multiplexed signal into a voltage signal having a predetermined level, the optical transceiving module converting the voltage signal into an optical signal, outputting the optical signal to the subscriber set-tops, and providing the second differential driver with signals transmitted from the subscriber set-tops.
2. The subscriber distribution network apparatus as claimed in claim 1, wherein the network switch connects with the SLUs without any outside media attachment units (MAUs) having unshielded twisted pair (UTP) cables and media converters (M/C).
3. The subscriber distribution network apparatus as claimed in claim 2, wherein the network switch and the plurality of SLUs are arranged on said backplane board.
4. The subscriber distribution network apparatus as claimed in claim 1, wherein the network switch and the plurality of SLUs are adapted for arrangement on said backplane board.
5. The subscriber distribution network apparatus as claimed in claim 1, wherein each of the subscriber line units further comprises a PHY for converting voltage signals transmitted from the subscriber set-tops through the optical transceiving module into SMII serial signals and providing the SMII serial signals to the second differential driver.
6. The subscriber distribution network apparatus as claimed in claim 1, wherein the first differential driver converts SMII signals into differential SMII signals, and the second differential driver converts differential SMII signals into SMII signals.
7. The subscriber distribution network apparatus as claimed in claim 1, wherein the signal converter converts the SMII serial signals into MII parallel signals.
8. The subscriber distribution network apparatus as claimed in claim 1, wherein the time division multiplexing processing unit includes a TDM and a positive emitter control logic (PECL).
9. A subscriber line unit provided in a subscriber distribution network apparatus and connected to a network switch which converts serial signals of Ethernet data and broadcasting data into differential signals and outputs the differential signals, the subscriber line unit communicating with a plurality of subscriber set-tops, the subscriber line unit comprising:
a differential driver connected to the network switch through a connector to restore the differential signals outputted from the network switch into serial signals;
a signal converter for converting the serial signals outputted from the differential driver into parallel signals;
a time division multiplexing processing unit for multiplexing Ethernet signal and broadcasting signal outputted in parallel to each other from the signal convener and converting the multiplexed signal into a voltage signal having a predetermined level; and
an optical transceiving module converting the voltage signal into an optical signal and outputting the optical signal and providing the differential driver with signals transmitted from the subscriber set-tops.
10. The subscriber distribution network apparatus as claimed in claim 9, further comprising a PHY for converting voltage signals transmitted from the subscriber set-tops through the optical transceiving module into SMII serial signals and providing the SMII serial signals to the differential driver.
11. The subscriber distribution network apparatus as claimed in claim 9, wherein the time division multiplexing processing unit includes a TDM and a positive emitter control logic (PECL).
12. A backplane board of a subscriber distribution network apparatus, the backplane board comprising a network switch and a plurality of subscriber line units, the network switch switching Ethernet data and broadcasting data, the plurality of subscriber line units being provided between the network switch and subscriber set-tops, providing data from the network switch to a corresponding subscriber set-top, and providing data transmitted from the subscriber set-tops to the network switch,
wherein the network switch includes a switch chipset and a first differential driver which converts serial signals of Ethernet data and broadcasting data outputted from the switch chipset into differential signals, and
wherein each of the subscriber line units includes a second differential driver, a signal converter, a time division multiplexing processing unit, and an optical transceiving module, the second differential driver being connected to the first differential driver through a connector and restoring the differential signals into serial signals, the signal converter converting the serial signals outputted from the second differential driver into parallel signals, the time division multiplexing processing unit multiplexing Ethernet signal and broadcasting signal outputted in parallel to each other from the signal converter and converting the multiplexed signal into a voltage signal having a predetermined level, the optical transceiving module converting the voltage signal into an optical signal, outputting the optical signal to the subscriber set-tops, and providing the second differential driver with signals transmitted from the subscriber set-tops.
13. A method for converting serial signals of Ethernet data and broadcasting data into differential signals of a subscriber line unit (SLU) and outputting the differential signals by the subscriber line unit provided in a subscriber distribution network apparatus and connected to a network switch, said method comprising the steps of:
(a) connecting a differential driver of the SLU to the network switch through a connector without using outside media attachment units (MAUs) having unshielded twisted pair (UTP) cables and media converters (M/C), to restore the differential signals output from the network switch into serial signals;
(b) converting the serial signals output from the differential driver into parallel signals;
(c) multiplexing both an Ethernet signal and a broadcasting signal output in parallel to cach other from the signal converter by a time division multiplexing processing unit, and converting the multiplexed signal into a voltage signal having a predetermined level; and
(d) converting the voltage signal into an optical signal and outputting the optical signal and providing the differential driver with signals transmitted from the subscriber set-tops.
14. The method recited in claim 13, further comprising:
converting voltage signals transmitted from the subscriber set-tops through the optical transceiving module by a PHY chip into SMII serial signals and providing the SMII serial signals to the differential driver.
15. The method according to claim 13, wherein the time division multiplexing processing unit includes a (time division multiplexor) TDM and a positive emitter control logic (PECL).
US10/794,308 2003-09-16 2004-03-05 Subscriber distribution network apparatus and subscriber line unit that facilitates connection to network switch Expired - Fee Related US7450608B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2003-64071 2003-09-16
KR1020030064071A KR100566243B1 (en) 2003-09-16 2003-09-16 subscriber distributing network apparatus and subscriber transceiver

Publications (2)

Publication Number Publication Date
US20050078960A1 US20050078960A1 (en) 2005-04-14
US7450608B2 true US7450608B2 (en) 2008-11-11

Family

ID=34420521

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/794,308 Expired - Fee Related US7450608B2 (en) 2003-09-16 2004-03-05 Subscriber distribution network apparatus and subscriber line unit that facilitates connection to network switch

Country Status (2)

Country Link
US (1) US7450608B2 (en)
KR (1) KR100566243B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060184976A1 (en) * 2005-02-16 2006-08-17 Samsung Electronics Co.; Ltd Optical network for bi-directional wireless communication

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102821331A (en) * 2012-08-27 2012-12-12 苏州金纳信息技术有限公司 Smart grid OPGW (optical power ground wire) realization device

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5339315A (en) * 1991-05-24 1994-08-16 Matsushita Electric Industrial Co., Ltd. Cable broadcasting system and the transmission center for on demand program services
US5576874A (en) * 1991-07-31 1996-11-19 Alcatel Network Systems, Inc. Optical distribution shelf for a remote terminal of an optical fiber telecommunications network
US20020063924A1 (en) * 2000-03-02 2002-05-30 Kimbrough Mahlon D. Fiber to the home (FTTH) multimedia access system with reflection PON
US20030061341A1 (en) * 2001-09-26 2003-03-27 Infineon Technologies North America Corp. Media cross conversion interface
US20040022536A1 (en) * 2002-08-03 2004-02-05 Jun-Ho Koh Broadcast/communication unified passive optical network system
US6751417B1 (en) * 1999-02-17 2004-06-15 At&T Corp. Fiber and wire communication system
US6763025B2 (en) * 2001-03-12 2004-07-13 Advent Networks, Inc. Time division multiplexing over broadband modulation method and apparatus
US20040161236A1 (en) * 2003-02-10 2004-08-19 Jun-Ho Koh System for integrating broadcasting and communication technologies while ensuring qualities of services
US7076563B1 (en) * 2000-01-31 2006-07-11 Mitsubishi Denki Kabushiki Kaisha Digital content downloading system using networks
US7151529B2 (en) * 2001-11-22 2006-12-19 Darfon Electronics Corp. Input apparatus for hand-held electronic devices and computers
US7170859B2 (en) * 2001-02-28 2007-01-30 Fujikura Ltd. Media converter with integrated local information transmission function and fault alarm signal transmission system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5339315A (en) * 1991-05-24 1994-08-16 Matsushita Electric Industrial Co., Ltd. Cable broadcasting system and the transmission center for on demand program services
US5576874A (en) * 1991-07-31 1996-11-19 Alcatel Network Systems, Inc. Optical distribution shelf for a remote terminal of an optical fiber telecommunications network
US6751417B1 (en) * 1999-02-17 2004-06-15 At&T Corp. Fiber and wire communication system
US7076563B1 (en) * 2000-01-31 2006-07-11 Mitsubishi Denki Kabushiki Kaisha Digital content downloading system using networks
US20020063924A1 (en) * 2000-03-02 2002-05-30 Kimbrough Mahlon D. Fiber to the home (FTTH) multimedia access system with reflection PON
US7170859B2 (en) * 2001-02-28 2007-01-30 Fujikura Ltd. Media converter with integrated local information transmission function and fault alarm signal transmission system
US6763025B2 (en) * 2001-03-12 2004-07-13 Advent Networks, Inc. Time division multiplexing over broadband modulation method and apparatus
US20030061341A1 (en) * 2001-09-26 2003-03-27 Infineon Technologies North America Corp. Media cross conversion interface
US7151529B2 (en) * 2001-11-22 2006-12-19 Darfon Electronics Corp. Input apparatus for hand-held electronic devices and computers
US20040022536A1 (en) * 2002-08-03 2004-02-05 Jun-Ho Koh Broadcast/communication unified passive optical network system
US7289732B2 (en) * 2002-08-03 2007-10-30 Samsung Electronics Co., Ltd. Broadcast/communication unified passive optical network system
US20040161236A1 (en) * 2003-02-10 2004-08-19 Jun-Ho Koh System for integrating broadcasting and communication technologies while ensuring qualities of services

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060184976A1 (en) * 2005-02-16 2006-08-17 Samsung Electronics Co.; Ltd Optical network for bi-directional wireless communication
US7653058B2 (en) * 2005-02-16 2010-01-26 Samsung Electronics Co., Ltd. Optical network for bi-directional wireless communication

Also Published As

Publication number Publication date
KR20050027711A (en) 2005-03-21
KR100566243B1 (en) 2006-03-29
US20050078960A1 (en) 2005-04-14

Similar Documents

Publication Publication Date Title
US5756280A (en) Multimedia distribution network including video switch
US6317884B1 (en) Video, data and telephony gateway
US9749049B2 (en) DOCSIS protocol-based access method, apparatus, and system
EP1387511B1 (en) Broadcast/communication unified passive optical network system
US20020136232A1 (en) System and method for synchronizing telecom-related clocks in ethernet-based passive optical access network
US7940812B2 (en) Ethernet access device and Ethernet access method
US20060203844A1 (en) Method and apparatus for downstream ethernet overlay in optical communications
US20050068914A1 (en) Broadcasting and communication combining system based on Ethernet and method thereof
WO1997009827A1 (en) A distribution system
JP3594616B2 (en) Telecommunications network with improved access protocol
CN1084987C (en) Hybrid fiber/coaxial video and telephony communication system
US20040141758A1 (en) System and method for providing multiple services to a destination via a fiber optic link
RU2153231C2 (en) Method and device for commutation in asynchronous transmission mode for processing voice calls
US7450608B2 (en) Subscriber distribution network apparatus and subscriber line unit that facilitates connection to network switch
US7342884B2 (en) Method and apparatus for one directional communications in bidirectional communications channel
US7489686B2 (en) Optical network unit for an access network employing IEEE 1394
US7263101B2 (en) Host digital terminal
CN1196300C (en) Communication network using different transmission properties
KR100584395B1 (en) Apparatus for transmitting mpeg-ts
KR100526561B1 (en) system for digital broadcasting service using ethernet protocol and method for transmitting digital broadcasting data thereof
KR100547890B1 (en) Broadcasting & Communication Convergence System for Implementing Subscriber Distribution Network
KR100740371B1 (en) Ethernet switch for fiber-to-the home
KR100223657B1 (en) Apparatus and method of teansmitting and receiving control imformation among telephone station and network system of vod service
KR100609687B1 (en) Apparatus for line interface and IP broadcasting system
KR101029365B1 (en) The optical network structure and data transport method for IPTV data transport

Legal Events

Date Code Title Description
AS Assignment

Owner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOI, JEONG-SEOK;CHA, DO-HUN;OH, YUN-JE;AND OTHERS;REEL/FRAME:015058/0419

Effective date: 20040227

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FEPP Fee payment procedure

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20161111